IEC 62026-7:2010 defines an interface system for bit-level and word-level communication between controllers and control devices like sensors, actuators, and switching elements. The system uses round or flat cabling with a two-conductor signaling pair and optionally a two-conductor power supply pair. It sets requirements for component interchangeability with these interfaces. This edition replaces the 2009 IEC/PAS 62026-7, offering general technical revisions and clarifications without significant changes to the technology.